found so cause for concern. >> tamerlan got involved in the religion, five years ago. he never told me that he would be like on the side of jihad. he was controlled by fbi like for five -- three, five years. they knew what my son was doing. >> the aspiring boxer was arrested in 2009 for domestic abuse. in years following, he quit school, wed a woman named katherine russell, and became a father. his wife's family releasing this statement. our daughter has lost her husband today, the father of her child. we cannot begin to comprehend how this horrible tragedy occurred. in the aftermath of the patriot's day horror, we know that we never really knew tamerlan tsarnaev. his uncle also in shock. >> he decided to take lives of innocent people, hurt innocent people. i may believe he has been full of evil, maybe he has been himself as evil, he turned to be an evil, even if there's speculation that there was some political views, no, there were no political views. i say there were no political based on what i know about him. and i know about that family. >> reporter: their russia